Finish DSSS demodulation stage 1

1 files changed, 19 insertions, 6 deletions

diff --git a/controller/fw/tools/dsss_demod_test.c b/controller/fw/tools/dsss_demod_test.c
index 51742b1..4370f80 100644
--- a/controller/fw/tools/dsss_demod_test.c
+++ b/controller/fw/tools/dsss_demod_test.c
@@ -13,11 +13,11 @@
 #include "dsss_demod.h"
 
 void print_usage() {
-    fprintf(stderr, "Usage: dsss_demod_test [test_data.bin]\n");
+    fprintf(stderr, "Usage: dsss_demod_test [test_data.bin] [optional recording channel number]\n");
 }
 
 int main(int argc, char **argv) {
-    if (argc != 2) {
+    if (argc != 2 && argc != 3) {
         fprintf(stderr, "Error: Invalid arguments.\n");
         print_usage();
         return 1;
@@ -46,7 +46,18 @@ int main(int argc, char **argv) {
         return 2;
     }
 
-    fprintf(stderr, "Reading %zd samples test data...", st.st_size/sizeof(float));
+    int record_channel = -1;
+    if (argc == 3) {
+        char *endptr;
+        record_channel = strtoul(argv[2], &endptr, 10);
+        if (!endptr || *endptr != '\0') {
+            fprintf(stderr, "Invalid channel number \"%s\"\n", argv[2]);
+            return 1;
+        }
+    }
+
+    if (record_channel != -1)
+        fprintf(stderr, "Reading %zd samples test data...", st.st_size/sizeof(float));
     size_t nread = 0;
     while (nread < st.st_size) {
         ssize_t rc = read(fd, buf, st.st_size - nread);
@@ -66,18 +77,20 @@ int main(int argc, char **argv) {
 
         nread += rc;
     }
-    fprintf(stderr, " done.\n");
+    if (record_channel != -1)
+        fprintf(stderr, " done.\n");
 
     const size_t n_samples = st.st_size / sizeof(float);
     float *buf_f = (float *)buf;
 
-    fprintf(stderr, "Starting simulation.\n");
+    if (record_channel != -1)
+        fprintf(stderr, "Starting simulation.\n");
 
     struct dsss_demod_state demod;
     memset(&demod, 0, sizeof(demod));
     for (size_t i=0; i<n_samples; i++) {
         //fprintf(stderr, "Iteration %zd/%zd\n", i, n_samples);
-        dsss_demod_step(&demod, buf_f[i], i);
+        dsss_demod_step(&demod, buf_f[i], i, record_channel);
     }
 
     return 0;